Centerless grinding



y 1931- G. W. BINNS 13%,197

CENTERLES S GRINDING Origirial Filed April 17, 1926 6 Sheets-Sheet 1 May 5, 1931. G. w. BINNS ETAL 1,894,197

CENTERLESS GRINDING Original Filed April 17, 1926 6 Sheets-Sheet 2 May 5, 1931. e. w. BiNNs ET AL CENTERLESS GRINDING Original Filed April 17, 1926 6 Sheets-Sheet 3 5 was Hg/2 ea $.77M91mmyer Strum;

CENTERLESS GRINDING Original Filed April 17, 1926 6 Sheets-Sheet 4 Ilia /Z 0 00 55 2 I 1 5? 47 my! 55 z 47 fi 1 h May 5, 1931. e. w. BINNS ET AL v ,8 97

CENTERLESS GRINDING Original Filed April 1'7, 1926 6 Sheets-Sheet 5 Patented May 5, 1931 UNITED srA-rs's PATENT. oer-"ice;

anon en w. ums, WALTER n. nnnnns'rnn r. nmmena, or OINCINNATI, .onro, ASSIGNORS, BY MESNE nssremrnnrs, 'ro CINCINNATI emu-ones moon- 'romrnn, or cmcmna'rr, 01110, A. CORPORATION or OHIO cmrrnnnnss eanmnie Application filed April 17, 1926, Serial No. 102,762. Renewed August- 15, 1929.

".VThis invention relates to grinding apparatus and more particularly to grinding apparatus in which the rotation of work of round section is controlled by a regulating wheel while a inding wheel performs a grinding operation thereon.

I One-of; he objects of this invention is to provides. grinding apparatus of the abovementioned character that will beof thoroughly practical and rugged construction and of'dependable and eificient action in practical use. I Another object is to rovide a grinding ap- 1 pa-ratus' having a grinding wheel and a work- 'rotation-controlling or regulating wheel 'in f work and which, therefore, are to be g to and remoyin'g-them'from thewhich rapid and accurate grinding may be achieved of'work pieces which it is either notdesired or impossible to feed through the apparatus in the direction of the axis ofth;

by .what is'now known in the art as the nfeed method of grinding. Another-ob ject is to provide a simple, rugged and practical mechanism for. supplying work pieces grinding throat of which the grinding wheel and the regulating wheel form apart. Another 0bject is to rovidea mechanism for controlling the relation-between the grinding throat and the work operated upon that will be capable ofa wide range of action withont'undue 5- complicationof parts and capable of ready and rapid pre'determination to suit the particular conditions met with in practice.

" Another object is to provide a mechanism for controlling the successive changes in the relation ofthe grinding throat to the work which mechanism, though actuatedby a single fixed cam, is, nevertheless, capable of a wide range of change in action without changing the cam.

matic grinding apparatus of the above-mentioned character in' which the cyclic feeding of the work into the grinding throat followed one or more changes in the relationof the grinding throat to the work and followed by ejection'of the work fromtlie 9:; tgrmittently, at will- Q pable of achieving high efficiency and ac- Another object is to provide a fully auto Another object is to provide a grinding apparatus of the I above-mentioned character that will be capable of great ease and convenience of manual control and adjustment, ca-

curacy of action, and well adapted to meet the varying conditions of hard practical use. Other objects willbe in art obvious or in part pointed out hereina er. I 4

The invention accordingly consists in the 60 features of construction, combinations of ele-v ments, and arrangements of parts 'aswill be exemplified inthe structure to be hereinafter described and the scope of the application. of which will be indicated in the following claims. In the accompan are shown several 0 various ments of this invention- F'gur'e 1 is a front elevation of the grinding apparatus, certain parts. being broken away and certain parts being shown insection, in order to illustrate certain parts of the construction more clearly;

Figure 2 is an end view as seen from the ri%ht of Figure 1;. igure 3 is a plan view on an 'enlar ed scale of portionsof the controllin mec anism seen at the right-hand end of igure 1, certain parts being broken away and certain partsbeing shown in section to illustrate certain features of the invention more clearly; Figure 4 is a vertical sectional view as seen along the line 44 of FigureB; Figure 5 is avertical sectional view as seen along the line 5-5 of Figure 3; a

Figure 6 is a vertical sectional view as seen alongthe of Figure 4;; Figure 7 etached semi-diagrammatic vi'emof certai' the pa rts shown in Figure 4 illustrating a possible relation between g drawings in which possible emboditrolling cam; Figure 8 is afview similar to control cam;

theiiiarts for changing the actionof the con- Figure 9 is a view sirn'ilar to that of 3, illustrating a possible modified form of 'ioo mechanism for altering the action of the control cam;

Figure 10 is a vertical-sectional view as part of the cam and of parts coacting therewith, as seen along the line 1 114 of Figure 11; v

Figure 15 is a perspective view, certain parts being broken away, of one of the memers coacting with the cam;

Figures 16, 17, 18 and 19 are diagrammatic views illustrating various possible changes that may be achieved in the action of the single control cam;

Figure 20. is a diagrammatic front view of the parts making up the grinding throat and showing diagrammatically the position of these parts with respect to the work during the grinding operation;

Flgure 21 is a similar diagrammatic view showing the relation of the parts of the grinding throat to the work when the latter is to be ejected;

Figure 22 is a face view of the single control cam;

Figure 23 is 'a sectional view through the hand feeding mechanism.

Similar reference characters refer to similarparts throughout the several views in the drawings.

Referring now more particularly to Figures 1 and 2 of the drawings, the grinding apparatus embodying our invention is there illustrated in assembled relation and includes a main base or standard A at the left-hand end of which, as seen in Figure 1, there is rotatably mounted in any suit-able manner a grinding wheel G: the grinding wheel G is driven at a suitable grinding speed byany suitable means and is preferably operative by way of itsperipheral face, the wheel being driven in such a, direction that its operative peripheral face travels in a direction downwardly toward a suitable work-supporting member C positioned to the right of the grinding wheel G and hence between the latter and wheel is driven at a slow or Work rotat'ioncontrolling speed and in a direction opposite from that in which the adjacent operative surface of the grinding wheel travels. The rela tion of the several parts "making up the throat is diagrammatically indicated in Figure 20. Any suitable means may be utilized to drive the regulating wheel.

base A there is slidably mounted, in suitable ways, a carriage or slide E, movable in a direction toward or away from the grinding wheel G. This slide E may be locked in adjusted position b means of the clamp F. At its left-hand env the slide E carries or supports the work support C, as is clear from Figure 1.

The regulatin wheel R, its housing, and drive, are carrie by a supplemental carriage or slide B movable in a direction toward or.

away from the grinding wheel G and slidabl Upon the upper right-hand portion of the supported, in suitable ways, upon the slide l By suitably adjusting the position of the slide E in a direction toward or away from the grinding wheel G, the position of the work support C relative to the grindingwheel G (Fig. 20) may be predetermined tosuit the particular conditions of practical use, where'- upon theslide E may be clamped to the base A by manipulation of the clamp F. The actuation or control of the slide B which carries the regulating wheel R is achieved by mechanism more clearly described hereinafter.

As hereinabove mentioned, it is sometimes undesired and at other times impossible, due

to the shape of the work to be operated upon,

as well as other factors, to effect an axial movementof the work piece while it is being operated upon by the grinding wheel. For

example, where the Work is shouldered, as

when it has several round sections of.difierent diameters, or where the work is of special contour other than straight cylindrical, it is impracticable to eflect axial movement of the work if the grinding wheel is to grind the different portions of the work. It is particu- 2 ing by the grinding wheel, and its subsequent removal from the grinding throat during appropriately spaced periods in the course-of which the grinding roat is enlarged, preferably by increasing the separation between the.

grinding wheel G and the regulating wheel R. A preferred manner of enlarging the grinding throat is diagrammatically illustrated in Figure 21 in which one of the elements making up the grinding throat,'namely, the regulating wheel R. will be seen to be moved away from the grinding wheel G sufiiciently to permit the insertion or removal of the work piece W with respect thereto. y During such an enlargement of the grinding throat we make effective a suitable ejector mechanism K (Figs. 1 and 21) to move the finished work piece out of the grinding throat while a suitable feeding mechanism serves to introduce a new work piece, from the magezinc M, for example (Fig. 1) into the grindin throat.

estriction of the grinding throat, as by movement of the regulating wheel R, carried b the slide B, toward the grinding wheel G, t ereupon ensues, the regulating wheel moving the work into and against the grinding wheel until the desired amount of material has been ground off of the work by the grinding wheel, whence enlargement of the grinding throat follows and the grinding throat made ready for the ejection of the completed work piece and the insertion thereinto of a new work piece.

One of the dominant aims of this invention is to provide an apparatus by which such grinding operations as those immediately above mentioned may be carried out eflicient ly at high speed with minimum loss of time between succeeding steps-or operations of the various parts of the apparatus and in a man; ner fully automatic while at the same time making it possible to readily adapt theapparatus to widelv varying conditions bgought abolit by different kinds of material operated upon, all without detracting from such advantages as have just been pointedout. For example, the extent of restriction and en lar ement of the grinding throat may vary wi ely, depending upon various factors, and

, this invention aims to achieve a wide range of restrictionor enlargement of the grinding throat with simple, thoroughly practical and "readily operable mechanism for thus meeting the varying conditions of practical use.

- right of the apparatus, as viewed in Figure '1, and terminating in a handwheel 48. The

adjusting'screw 47 passes through an auxiliary bracket or housing 26 attached to the right-hand. end portion or extension (see Fig. 1) of the base A and is rotatably and slidably supported in suitablebearings, as 150 (see Fig.3) formed in the housing 26. Suitable means, described/in detail below, may be utilized to hold the adjusting screw 47 against movement-in an axial direction relative to the housing 26 so that rotation of" the screw 47 by the hand wheel 48 can be made effective to manually adjust the position of the regulating wheel R relative to the work-support C and the grinding Wheel G.

Also, the nut 49 (see Fig. 1) has secured thereto a handle 50 and isrotatably mounted wheel housing or carriage B so that the nut 49 may be given a limited rotary movement by the handle 50-to achieve a further adjust. ment of the regulating wheel slide B and the regulating wheel R ltself toward or away from the grinding wheel G.

The housing 26 is bored out as at 51 (see Figs. 5, 6 and 3) and slidably mounted 1n this bore 51, which thus provides slideways therefor, is a slidable block 52 through which the shank of screw 47 passes. The shank of screw 47 and the block 52 are related in any suitable manner so that rotation of the screw 47 with respect to the block 52 may freely take place while movement of translation of the block 52, in a direction toward the right or left along the bore or slideways 51, as

viewed in Figure 3, is transmitted to the screw 17 and hence to the regulating wheel slide B and the regulating wheel R carried thereby.

The movement of the slide block 52 alongthe bore 51 is effected by acam generally indicated at 36 (Figs. 3, 4.- and 6) provided with a cam groove 37 (see Fig. 22) in its side face, the cam groove having suitable portions adapted to give the restriction and enlargement of the grinding throat certain desired characteristics.

shown in Figure 22, is provided with aportion 38-.39which is substantially of the same radius throughout so that, through the mechani'sm interposed between the cam and the slide block 52, the regulating wheel R remains withdrawn in a position toward the right from that shown in Figure 1. During Preferably, the cam groove, as is better this interval ejection of a ground work piece I and the feeding into the grinding throat of a new.w0rk .piece may take place. The cam 36 rotates in the direction indicated by the arrow in Figure 22 and following the portion 38-39, the cam groove has a portion 39-40 of relatively rapid increase in radius and having, therefore, a rather steep pitch; this ortion 3940 is made to restrict thegrin ing throat, by effecting movement of the regulating wheel'B (,see Fig. 1) in a direction toward the left, and to initiate the grinding of the work by the grinding wheel while the regulating wheel controls the rotation thereof. Thence follows a portion 4041 of very grad ual rise or very gradual increase in radius and extending throughout an arc of about 150; during this portion the reduction in diameter of the work proceeds, the grinding throat being restricted to substantially exactly the diameter to which the work piece is to be reduced. Thence follows a portion 41-42 of the cam groove which is of substantially the same radius throughout is extent so as to hold the grinding throat re stricted .for a short period of time during or finish-grind the work. Immediately following the portion 41-42 of the cam groove 37, there is a portion 42-38 of relatively rap- 1 Figure 1, and hence the grinding throat ennism, to

larged to permit ejection and replacement of the work to take place.

The cam has formed .upon itsperiphery a lug or projection 44 (see Figs. 22 and 4) for engagement with and control of the work-. feeding mechanism, all to be hereinafter more clearly described, and'on one face the cam 36 is provided with a cam lug 45, as is better shown in Figures 5 and 3, for engagement with and control of the work-ejecting mechabe more clearly described herein after. Also, the cam 36 is provided with a recess 46, as is shown in Figure 5, for coaction with certain other controlling mechanisms more clearly described hereinafter.

Considering now a preferred .form of mechanism'interposed between the cam 36 .61 (see Flgs. 4, 7 and 8) W111 be seen to be and the slide block 52, it might first be noted that thecam 36 is mounted within the hous-- ing 26 to rotate about the axis of a shaft 27 (see Figs. 6 and'4) extending crosswise of the apparatus and rotatably mounted in a suitable bearing 43 formed in the housing 26. At the right-hand end of the shaft 27 (as viewed in Fig. 6) there is secureda worm wheel 28 driven by a worm 29 which, in turn, referring now to FigurelO, is driven from the motor 32 through the gearing 30-31. The motor 32 is secured to the underside of the housing 26 (see Figs. 1 and 4) and the gearing 30-31 is encased in a suitable auxiliary housing 26. Asuitable clutchmechanism, to be more clearly described hereinafter, connects the shaft 27 (Fig. 6) with the 'cam 36. Extending above and substantially parallel to the shaft 27 (see Figs. 6 and 4) and supported in suitable bosses v26 and 26 within the housing 26 is a shaft 59 upon which'is mounted for oscillation a lever generally indicated at 61. Lever 61 has a downwardly extending arm 61 at the lower end of which is mounted a roller 62 (Figs. 3, 4 and 6) which ridesin the cam groove 37 of the cam 36 so that the lever 61 oscillates about the.

shaft 59, in accordance with the ab0ve-de scribed preferred form or shape of the cam groove 37. l;

: The upper arm 61 of the lever 61 is provided with a transversely extending slot 63 (see Figs. 4, 7 and 8) into which extends a clamping bolt 64 for clamping the upper arm 61 together with the substantially vertically extending arm 60 (see Fig. 6) of a bell crank lever 60-58 also mounted for oscillation about the shaft 59 and to the right of the lever 61, as viewed in Figure 6. The bell crank lever 58-60 has its two arms extendbers 56 are .pivotally connected to the slide block 52 by means of a pin 56- (see Fig. 5).

As the lever 61 swings at intervals and at successive rates, all as determined by the cam groove 37 of the cam 36, it swings the bell crank lever 60-58 at like intervals and rates, arm 61 of the bell crank lever and arm 61" of the lever 61 being clamped together by the clamping bolt 64. The resultant swinging of the arm 58 of the bell crank lever is communicated, through the link 56, to the slide block 52, the latter communicating like or similar movements to the regulating wheel slide B.

The slot 63 in the upper end of the arm of substantial extent in a direction transversely of the arm 61 and is of such extent in order to permit of the desired latitude or range of change in the relation between the which the bolt 64 may be clamped, the two levers may be related to each other in the two extremes indicated in Figures 7 and 8, or in any desired intermediate -relation between these two extremes.

With a given fixed range of movement Ff the lever 61, under the action of the cam 36, the range of change in the relation between the two levers permits a change in the range of movement of the slide block 52,-and hence ofthe regulating wheel R, without necessitating replacement of the fixed cam by another cam. Referring to Figures 7 and 8, and bearing in mind that-the pin 56, which pivotally connects the link 56 to the slide block 52, partakes of a straight line motion in a horizontal direction, as viewed in these two figures, the range or stroke of movement transmitted to the pin 56? from the cam 36 increases in length as the relation between the two levers changes from that shown in Figure 7 to that shown in Figure 8.

With the parts as shown in Figure 7, oscillation of the lever 61 oscillates the arm 58 of the bell crank lever 58-60 and hence oscillates the connecting pin 57 a through an arc, the chord of which a proaches the vertical, as viewed in Figure 7, while oscillation of the arm 58 and of the pin 57" in the relation to the lever 61, as shown in Figure 8, takes and enlargement of the grinding throat throu h successive steps as determined by the c aracteristics of a single cam, such as the above-described cam 36, though permitting a relatively wide range of change in the limits of movement of the movable member of the inding throat, all while retaining .the desired characteristics of the successive of which (see Figs. 6 and 3) is rotatably cam portions.

To facilitate the selection of any desired movement within the above-mentioned range, we find it convenient to provide graduation marks 167 upon-the upper end face of the lever arm 61" (see Fig. 3) to coact with an index mark 168 upon the lever arm 60. These gra'duations will be seen to be intermediate of the adjusting screws 65 and 66 and thus the desired relation ofthe parts me. be readily achieved.

- ctuated in timed relation with respect to the enlargement and restriction of the grinding throat, and preferably under the control of the same cam 36, are the work-feeding and ejecting mechanisms. Considering first the work-feedin mechanism, there is shown in Figure 11a agazine M extending verticall and adapted to receive a supply of Wm pieces to be operated upon. Coasting with the magazine is a suitable feed slide 0 (Fig. 1) slidably mounted for movement in a direction transverselly to the plane of the sheet of paper bearing igure 1 under the control of an arm L suitabl coupled to the slide 0 at its upper end an secured at its lower end to the feed-trip-shaft 67 which extends lengthwise along the front of the machine, as is clearly shown in Figure 1, and'at its rightmounteda roller which is adapted to ride upon the periphery of the cam 36 (Fig. 3) as the latter rotatu.

As hereinabove noted in connection with Figure 22, the cam 36 is provided with a cam lug 44 upon its periphery, the periphery of the cam 36 being otherwise circular. The

roller 70 and the rocking gear segment 69 are thus held immovable during such portions of the rotation of the cam 36 as will bring the circular periphery of the cam in contact with the roller 70, but as soon as the cam lug 44 is brought into contact with the roller 70, the

"gear segment 69 is momentarily rocked in counter-clockwise direction, as viewed in Figure 6, giving the trip-shaft 67 a momentary rotation in clockwise direction, thus actuating the arm L (Fig. 1) and the feed slide 0 coupled thereto, thus to feed a new work piece on to the work support C (Figs. 20,21). This action preferably takes place during an enlargement of the grinding throat, and it may, for example, ta e place at a time when the/portion 3839 of the cam groove 37 of the cam 36 (Fig. 22) is operative upon the regulating wheel slide B. A suitable spring, for example, the spring 67 (Fig. 1), acting upon the shaft 67, maintains contact between the roller 70 and the periphery of the cam 36.

For controlling the ejection of a finished or ground work piece from the grinding throat, we provide a second trip-shaft 71 (Figs. 1, 5 and 4) coupled at its left-hand end as viewed in Figure 1, to the ejector mec anism K and extending at its right-hand end into the. housing 26 where it is journaled in a suitable bearing 71 (Fig. 4). Upon its extreme right-hand end (see Fi 4) the shaft 71 has secured thereto a collar 2 notched in its periphery as at 72 (see Fig. 5). The notched collar 72 is arranged to be engaged b a pawl 73 (Fig. 5) in the form of a suit.- ah ly shaped bar mounted to slide in a direction toward the right or left, as viewed in Figure 5, in suita le bearings 73 and 73 formed in the interior of the housing 26.

A lever 74 is coupled at its upper end to the pawl member 73 (Fig. 5) and at its lower end it is pivotally secured, as by the screw 74 to a suitable part of the interior of the housing 26. Intermediate of its ends the lever 74 is provided with a contact member 75 which is positioned in the path of movement of the cam lug 45 on the side face of the cam 36.

The cam lug 45 is so positioned with respect to the various portions of the cam groove 37, and with respect to the cam lug 44, that the contact member 75 is engaged and the lever 74 thrown to the right, and hence in the position shown in Figure 5, at a time when the grinding. throat is enlarged, and preferably just prior to the actuation of the feed slide 0, as above described. A

Movement of the pawl member 73 to the right and into the position shown in Figure 5 causes the pawl to engage in the notch'72 ,in

the collar 72 on the shaft71 and to cause the latter to be swung. in a clockwise direction, as viewed in Figure 5, the ejector K (Figs. 1 and 21) being thereby actuated to force the completed work piece out of the grinding throat.

The operations above described may be carried on in successive or repeated cycles or, in accordance with certain other features of our invention, may be confined to individual manually controlled cycles. As above noted in connection with Figure 6, the cam 36 is driven from the shaft 27 through a clutch. Conveniently the cam 37 has formed thereon clutch teeth 35 (Figs. 6 and 3) for coaction with a shiftable clutch collar 33 provided .with clutch teeth 34 adapted to engage with the clutch teeth 35 on the cam 36. As clearly indicated in Figure 6, the clutch collar 33 is splined to the shaft 27 and is provided with an annular groove 76 (Fig. 3) which receives the clutch-shifting yoke 77 (Figs. 3, 4 and 6) pivoted upon a pin 78 held in a suitable interior portion of the housing 26. The shifting yoke 77 is provided with another shifting yoke portion 79 (Figs. 3, 4 and 5) which fits into the groove 80 of a sleeve 81 (Fig. 5) slidably mounted in a suitable bored out portion 82 of the housing 26. Extending lnto the sleeve 81 is a plunger 83 carrying at its right-hand end (Fig. 5) a hookshaped head 84 adapted, under the urge of a spring 86 interposed between the head 84 and an annular web 85, to ride into the cam recess 46 in a side face of the cam 36. The spring 86 at other times urges the plunger 83 and its head 84 out of the sleeve and into engagement with the side face of the cam 36.

At an intermediate portion the plunger 83 has secured thereto a collar 87, limiting the movement of the plunger 83 in a direction toward the right, under the urge of the spring 86. To the left of the collar 87 and surrounding the plunger 83 is another spring 88 whose left-hand end bears against a cap 89 secured to the left-hand or outer portion of the bored out portion 82 of the housing 26, this cap 86 having an opening through which the lunger 83 passes and having a slot exten 'ng across the outer face of the cap member into which a lug 96 on the knurled head 95 may be seated and held under the urge of the spring 88.

The sleeve 81 is formed with a rack portion 90 along its upper left-hand end (Fig. 5) with which meshes a pinion 91 on a rock shaft 92 (Fig. 1) extending across the front of the machine and adapted to be actuated by a handle 93 positioned for convenient access.

Assuming the parts to be in the position shown in Figure 5, in which the sleeve 81 will be seen to be urged in a direction toward the right under the action of the spring 88, so as to seat the hook-shaped head 84 in the cam r 46, the shifting yoke 79-77 will be cam 36 (see also-Fig. 6). The cam 36 will thus be at rest and the various parts controlled and actuated thereby will likewise be at rest. 7

When it is desired to start the cyclic operation of the mechanism for enlarging and restricting the grinding throat and for fee'de ing and ejecting the work with respect. thereto, the operator swings the handle 93 (Fig. 1) in a direction toward the apparatus, giving the shaft 92 a clockwise rotation of sufficient extent to move the sleeve 81 (Fig. 5), through the gear 91 and rack90, in'a direction toward the left, as viewed in Figure 5, thus swinging the shifting yokes 7977 (see Fig. 3) in counter-clockwise direction to effect inter-engagement between the clutch teeth 34 and 35; The cam 36 (see Fig. 6) .being thus connected to the driven clutch collar 33, begins to rotate, the inclined portion 94 (Fig. 5) of the cam recess 46 acting to cam the head 84 of the plunger 83 out of the recess 46 against the action of the spring 86, which thus remains compressed while the head 84 rides on the face of the cam 36. This compression of the spring 86 holds the sleeve 81 in the position in which it was initially moved by theoperator (through handle 93) and thus holds the clutch members 34 and 35 (Fig. 3) in engagement, maintaining the drive of the cam.

A single revolution of the cam 36 is sufiicient to complete a cycle of operations of the various mechanisms, as already above described, but as the single revolution of the cam 36 is completed, cam recess 46 (Fig. 5) is again moved into juxtaposition to the head 84 on the plunger 83, whence the theretofore compressed springs 88 and 86 are permitted to expand, the plunger 83 moving toward the right, as viewed in Figure 5, and the head84 entering the recess 46. Such movement of the plunger 83 toward the right is accompanied by a movement in the same direction of the sleeve 81, spring 88 acting to move the sleeve 81 toward the right through the interposed collar 87 on plunger 83 and the web 85 against which the collar 87 rests. This movement of the sleeve 81 results in iving the shifting yoke 7 97 7 (Fig. 3) a su cient oscillation in clockwise direction to disengage the clutch member 34 from the clutch member 35 on the cam 36, thus disconnecting the cam from its driving source, halting the cam, and halting also the mechanisms actuate-d or controlled by the However, should it be desired to have the cam continue its rotation and thus to have the apparatus operate in successive or recurrent cycles, the operator need merely grasp the knurled head 95 of the plunger 83 (see Fig.5), pull the head in a direction toward the left, as Yiewed in Figure 5, and thus moving the sleeve 81' in a direction toward the left through the spring 86 interposed between the head 84 and the web 85. This shifting of the sleeve 81, as will now be clear, interconnects the clutch members 34 and 35 and initiates the driving of the cam 36.

The operator, after having. pulled the knurled head 95 and the plunger 83 attached thereto in a direction toward the left, as viewed in Figure 5, gives the head 95 a sufficient rotation about the axis of the plunger 83 so as to prevent the lug 96 from entering the recess in the outer face of the cap 89, thus holding the head 84 entirely out of engagement with the face of the cam 36.

The clutch members 34 and 35 are held in engagement by the resultant compression of spring 86. The apparatus may thus continue to operatie in recurring cycles but the operator may halt the apparatus at any time by manipulating the handle 93 through which the operator may shift the sleeve 81 toward the right, as viewed in Figure 5, and against the action of the spring 86, thus to disengage the clutch members 34 and 35 (Figs. 6 and 3) and thus stop the cam andthe apparatus actuated and controlled thereby.

Should the operator desire to halt the apparatus at the completion of any one cycle, he simply rotates the knurled head or knob 95 into a position such that the lug 96 thereon may enter the recess in the face of the cap 89, but this can occur only when the cam recess46 is brought into juxtaposition tothe head, 84 whence the latter may ride into the recess, permitting the lug 96 on the knob 95 to enter the recess in the face of the cap 89. As hasbeen pointed out above, when the head 84 enters the cam recess 46, sleeve 81 is moved in a direction toward the right by the spring 88, such movement of the sleeve 81 effecting disconnection of the clutch members 33 and 34. 7

Thus, the apparatus may be set to operate in recuring cycles, it may be stopped either at any moment or at the completion of any one of these recurring cycles, orthe apparatus may be made to operate for only one complete cycle and then automatically stop.

about to be described.

The screw 47 is made to move with the slide block. 52 by a construction similar to that which causes the screw 47 of Figures l 6 inclusive to move with the slide block 52;

described in connection with those figures and, referring to FigurelO, it might be pointed out that the spindle or screw 47 is provided with a shoulder 53 against which a suitable thrust washer. 54, interposed between the shoulder 53 and the slide block 52, bears while to the right" of the block 52 there is secured to the spindle or screw 47 a collar 55, preferably threaded onto the shank 47, so that the member 47 must partake of the same movement of translation Thus, it will be seen that there is great flexibility of control and action, particularly so when the wide range of change of action of the cam groove 37 (Fig. 22) of the cam 36 is borne in mind and.as may be accomplished by the hereinabove described range of change in the relation between the levers 5860 and 61 (Figs. 7 and 8, for example).

' Certain of the above described features of our invention may conveniently and, under certain circumstances, more advantageously be carried out in other and possibly more simple Ways, and in Figures 919 inclusive we have illustrated a possible modified vform of as is transmitted to the slide block 52 while the member 47 may be rotated relative to the slide block 52.

Housed in the housing 26 is acam 36 (see Figs. 9, l1 and 12) having a cam groove 37 of a configuration similar to that of the cam groove 37 of the cam 36 of Figure 22 and hereinabove described in detail. The cam 36 may be mounted and driven in a manner substantially similar to the cam 36 described in connection with Figures 3-6, but it may here be noted that the cam 36 is secured to and driven by a shaft 27, suitably supported for rotation in a bearing 130 (Fig. 12) suitably formed in the housing 26. The shaft 27 has secured thereto a worm Wheel 28 driven by the worm 29 in turn driven, through the gearing 3031 (Fig. 10), from a suitable source of motive power such as the motor 22 secured to the underside of the housing 26.

A lever 100, shaped somewhat as is shown in Figure 15, is mounted to pivot about a stud shaft 101 (F igs. 10, 11 and 12) extending crosswise of the housing 26 and rigidly supported-in a wall of the latter. The lever 100 is bored out at its lower end as at 102 (Fig. 15), thus providing a cylindrical seat within which is received a round or cylindrical plug 103 (Fig. 15) in which in turn is rigidly mounted but eccentrically thereto a pinor stud shaft 131.carrying a roller 104 which rides in the cam groove 37 of the cam The plug 103 may be adjustably positioned in the recess 102 by rotating the plug relative to the lever 100 and securing the plu'g in 7 (Fig. 11 being provided for locking or securing the plug 103 in its adjusted position.

' where it is connected to the slide block 52.

, into suitab le openings 100 (Fig. 15).

- be rotated through an angle of about 180 from the above-mentioned position, again locked or secured in its new position, whence the eccentrically mounted roller 104 will be found to be to the left of the axis of the plug 103, as these parts are viewed in Figures 11 and 14. The effect of such changes or adjustments will be pointed out hereinafter.

The lever 100 (see Fig. 15) has a lateral extension indicated at 100 (see also Fig. 12)

r the extension 100 being directed laterally of the housing 26 and into substantial juxtaposition to the slide block 52 (see Fig. .9),

As is clearly shown in Figures 12 and 15, the

. underside of the extension 100 of the lever 100 is slotted or recessed as at 100 and 100 and in these recesses are seated the link members 58 (Figs. 12 and 9), each link member 58 extending to one side of the slide block 52 to which it is pivotally connected as by the pivot pins 133. The other ends of the links 58 are pivotally connected to the lever extension 100 by suitable pins 134 extending The underside of the extension 100 (Fig. also has a slot 100 through which the spindle of the screw 47 (Figs. 10 and 12) asses.

As the lever 100 is swung about 101, under the control of the cam groove 37 of the cam 36 (see Fig. 11), movement is imparted to the slide block 52 and hence to the movable element, the regulating wheel R, of the grinding throat, in successive steps or H stages and at successive time intervals, as determined by the shape of the cam groove. As the lever 100 swings about its. axis .101, it operates upon the links 58 through a lever arm extending from the pivot 101 to the pivot 134 and, bearing in mind that the plug 103 is adjustably carried in the lever 100, so as to vary the position of the roller 104 with respect to the lever 100, the greater the angle between the lever arms 133134 and 134-101, the less will be the range of movement transmitted to the slide block 52 .and hence to the regulating wheel. roller 104 positioned to the right of the axis of the rotatable plug 103 and hence positioned as shown in Figures 11 and 14, the angle beits pivot With the tween the two above-mentioned lever arms is a relatively large, varyin from the angle shown in Figure 17 to t e angle of almost 180 shown in Figure 16. The range of movement transmitted to the pivot point 133' "rotated and secured in its new position, as

hereinabove described, and in Figures 18 and 19 We have diagrammatically shown the effect brought about when the plug is rotated through 180 from the position shown in Figure 11.- The angle between the lever arms 133134 and 134-101 will be seen to have been diminished and the range of movement of the pivot point 133, and hence of the slide block 52, will now be equal to the difference between the distance w of Figure 18 and the distance a of Figure 19, this distance being materially greater than the difference between the distances m and 3/ of Figures 16 and 17 Figures 16 and 18 show the relative position of the parts when the cam groove 37 has swung the lever 100 to its farthest position in clockwise direction, and Figures 17 and 19 represent the relative position of the parts when the cam groove has swung the lever 100 to its extreme position in counterclockwise direction. Thus. a change in the throw imparted to the regulating wheel may be readily achieved without changing the cam.

It is to be understood that the same feeding and ejecting and cycle-control devices described in connection with the preferred form of our invention shown in Figures 18 may be associated with the cam 36 of the form of our invention shown in Figures 919, and merely by way of indication of how these devices may be thus embodied, we have shown the cam 36 provided. with the lug'45 (Fig. 13) for periodic engagement with the contact 7 5 on the lever 74, the latter being pivoted as at 135 and yieldingly swung toward the cam 36 by a spring 136 (Fig. 13) The lefthand end of lever 7 4 interlocks with the pawl member 7 3 (Fig. 12) so that when the lever is swung in clockwise direction, as viewed in Figure 13, by the cam lug 45, the pawl member 7 3 engages with the notched collar 72 to oscillate the shaft 71*, similar to the shaft 71 of Figure 1,which controls the ejecting mechanism. 7

It will thus be seen that there has been provided in this invention an apparatus in which the various objects hereinabove set forth, as well as many thoroughly practical advantages, are successfully achieved. It will be seen that the invention is of a thoroughly practical nature, that the apparatus is capable of a wide range of action without necessitating the replacement of the*control cam, and that the characteristic of each different portion of the cam (Fig. 22) may be retained while changing the range of movement of the movable element of the grinding throat. It will furthermore be seen that the apparatus is well adapted to meet the varying conditions of hard practical use.

As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above setforth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

What we claim 1. The combination with a centerless grinder, including opposed grinding and regulating wheels forming a work-rece1ving throat, a work-supportwithin the throat, and means for causing a relative movement of one of said wheels to vary the width of the throat, said means including a driven cam, a rock lever, operated by the cam, and means for varying the amplitude of the grinding throat variation for the same are of movement of the rock lever.

2. A centerless grinding machine including a bed, opposed grinding and regulating avheels earned by the bed and means for imparting relative movement to said parts, one of the wheels being movable relative to the other, including a bracket carried by the bed, a side block movable in the bracket, a connection extending from the slide block to the m vable wheel, link mechanism pivoted to the slide block, a pivotally supported lever operatively associated with said link mechanism and means for rocking the lever to shift the link mechanism and slide block and thus impart an in and out movement to the shiftable wheel.

3. A centerless grinding machine including a bed, opposed grinding and regulating wheels carried by the bed and means for imparting relative movement to said parts, one of the wheels being movable relative to the other, including a bracket carried by the bed, a slide block movable in the br cket, a connection extending from the slide lock to the movable wheel, link mechanism pivoted to the slide block, a pivotally supported lever operativelyassociated with said link mechanism, means for rocking the lever to shift the link mechanism and slide block and thus impart an in and out movement to the shiftable wheel, said means including a rotatable cam member operatively associated with the lever.

4. A centerless grinder includin a bed, a grinding wheel carried by the be a regulating' wheel slidably mounted on the bed in opposition to the grinding wheel, and means for varying the'relati've positions of the grinding and regulating wheels, including a bracket carried by the bed, a block slidably supported by the bracket and ad. justing screw member swivelled within the block and having a threaded portion engaging the regulating wheel mount, whereby rotation of the screw when the block is stationary will impart in or out movement to the regulating wheel and means for imparting a sliding movement to the block and screw, said means including a driven rotatable cam, a lever pivoted to the bracket and actuated by the cam and connections between the lever and slide block for reciprocating the slide block on rotation of the cam.

5. A centerless grinder including a bed, a grinding wheel carried by the bed, a regulating wheel slidably mounted on the bed in opposition to the grinding wheel and means for varying the relative positions of the grinding and regulating wheels, including a bracket carried by the bed, a block slidably supported by the bracket and adjusting screw member swivelled within the block and having a threaded portion engaging the regulating Wheel mount, whereby rotation of the screw when the block is stationary will iming opposed grinding and regulating wheels and intermediate work-support, means for varying the'distance between the wheels for a cycle of operation upon a work-piece, said control means including a rotatable cam,

manual means for controlling rotation of the cam, and additional automatic means for stopping the cam at the completion of a cycle of movement thereof.

7. A control mechanism for a centerless grinder including a driven shaft, a clutch member splined on the shaft, a cam loosely mounted upon the shaft and having a clutch portion, a wheel shifting lever having a contact cooperating with the cam, and means for shifting the clutch on the shaft into operative engagement with the clutch portion of the cam for actuating the latter.

' 8. A control mechanism for a centerless grinder, including a driven shaft, a clutch member splined on the shaft, a cam loosely mounted upon the shaft and having a clutch portion, a wheel shifting lever having a contact cooperating with the cam, and means for shifting the clutch on the shaft into operative engagement with the clutch portion of the cam for actuatin the latter, and means for yie ldingly retaining the two clutch sections in inter ocking enga ement.

9. A control mec anism for a centerless grinder, including a driven shaft, a clutch member splined on the shaft, a cam loosely mounted upon the shaft and having a clutch' portion, a wheel shifting lever having a contact cooperating with the cam, and means for shifting the clutch on the shaft into operative enga ement with the clutch portion of the cam or actuating the latter, means for yieldingly retaining the two clutch sections in interlocking engagement and manual means for temporarily disengaging the clutch against the pressure of said yielding mechanism.

10. A wheel control mechanism for a centerless grinder, including a cam having a clutch portion, a driven member adjacent the cam having a second clutch portion, shifting mechanism for moving said clutch portions into operative engagement, one withthe other, said shifting mechanism including a cam engaging device and means on the cam cooperating with said device to disengage the clutch ata given point in the rotation of the cam.

11. A wheel control mechanism for a centerless grinder, including a cam having a clutch portion, a driven member adjacent the cam having a second clutch portion, shifting mechanism for moving 'said'clutch portions into 0 erative engagement one with the other, said shifting mechanism including a cam engaging device and means on the cam cooperating with said device to disengage the clutch at a given point in 'the rotation of the cam and additional manual means for controlling the position of the clutch independent of said automatic mechanism. 12. A? wheel control mechanism for a cen terless grinder, including a cam having a clutch portion, a driven member adjacent the cam, having a second clutch portion, shifting mechanism for moving saidclutch portions into operative engagement, one with the other, said shifting mechanism including a cam engaging device and means on the cam cooperating with said device to disengage the clutch at a given point in the rotation of the cam, additional manual means for controlling the position of the clutch independent of said automatic mechanism, the cam having a portion for resetting the automatic release mechanism on temporary manual reactuation thereof.

13. In a centerless grinder the combination with a shiftable work engaging member of a rotatable control cam therefore, having a portion for shifting the work engaging member.

in a predetermined cycle and having an additional cam portion for controllin its own actuation, a driving clutch engagea le with the cam for actuation thereof and a control member for the clutch, including a shiftable sleeve,

' a plunger within the sleeve having a head engaging the cam, means resiliently actuating the sleeve toward the cam to disengage the driving member for the cam and means on the cam permitting said inward disengaging own actuation, a dr'wing clutch engageable with the cam for actuation thereof and a control member for the clutch including a shiftable sleeve, a plunger within the sleeve, hav-' ing a head engaging the cam, means resiliently actuating the sleeve toward the cam to disengage the driving member for the cam and means on the cam permitting said inward disengaging movement at a predetermined point, and manually actuatable means for rendering said resilient disengaging mechanism inoperative.

15. In a centerless grinder, the combination with a shiftable work engaging member of a rotatable control cam therefore, having a portion for shifting the work engagingmember in a predetermined cycle and having an additional cam portion for controlling its. own actuation, a driving clutch engageable with the cam for actuation thereof, and a control .member for the clutch, including a shiftable additional cam portionfor controlling its operative, and additional manual means for shifting the sleeve to engage and disengage the clutch independent of the adjustment of the first mentioned manually operable means.

16. A combination with a centerless grinder, including a bed, opposed grinding. and regulating wheels mounted on the bed, one of said wheels being movable relative to the other to vary the width of grinding throat during operation of a work-piece and means for imparting movement'to said wheel, including a slide block, a link co'u led with the slide block, a rock lever pivota y associated with the link, a cam for impartingmovement to the rock lever, and means for varying the initial off-center position of the pivotal connection between the lever and link to vary the amount. of movement imparted to the slide block, and wheel for a given oscillation of the lever.

17 A- combination with a centerless grinder, including a bed, opposed grinding and regulating wheels mounted on the bed, one of I said wheels being movable relative to the other to vary the width of grinding throat during operation of a work-piece and means for impart-ing movement to said wheel, in cluding a slide block, a link coupled with the slide block, a rock leve-r pivotally associated with the link, a cam for imparting movement to the rock lever, and means for varying the initial oif-center position of the piv otal connection between the leverand link to vary the amount of movement imparted to the slide block and wheel for a given oscillation of the lever, and means for relatively adjusting the slide block and wheel to compensate fol-variance in limit of movement of the wheel, caused by adjustment of the link throw-mechanism.

18. In a centerless grinder, the combination with a shiftable work engaging member of a rotatable control cam therefore, having a portion for shifting the work engaging member in a pr determined cycle and having an additional cam portion for controlling its own actuation, a driving clutch engageable with the cam for actuation thereof, and a control member for the clutch, including a shiftable sleeve, a plunger within the sleeve, having a head engaging the cam, means resiliently actuating the sleeve toward the cam to disengage the driving member for the cam, means on the cam permitting said inward disengaging 1 ovement at a predetermined point, manually actuatable means for rendering said resilient disengaging mechanism inoperative, and additional manual means for shifting the sleeve to engage and disengage the clutch independent of the adjustment of the first mentioned manually operable means, and means for indicating the efiective movement of the wheel producable by said adjustment.

19. In a centerless grinder, the combination wjth opposed grinding and regulating wheels and an intermediate work-support forming a three point contact work-throat, means for imparting movement to one of said WOIk engaging members, said means including a slide block, a link for shifting the slide block, a spindle supported by the bed, a pair of lever' members oscillatably mounted on the spindle, one of said levers being of hellcrank formation, one arm of the bell-crank being pivotally associated with the link,

means for adjustably connecting the other arm of the bell-crank to the second lever and block, a spindle supported by the bed, a pair of lever members oscillatably mounted on the spindle, one of said levers being of bellcrank formation, one arm of the bell-crank being pivotally associated with the .link, means for adjustably connecting the other arm of the bell-crank to the second lever and meansfor rocking the second lever, the adjustable connection between the two levers varying the throw imparted to the slideiblock for the same amplitude of oscillations of the levers and means for indicating the relative adjustment of the levers.

slide block, a link for shifting the slide block.

a spindle supported by the bed, apair of lever members oscillatably mounted on the spindle, one of said levers being of bell-crank formation, one arm of the bell-crank being pivotally associated with the link, means for adjustably connecting the other arm of the bell-crank to the second lever and means for rocking the second lever, the adjustable connection between the two levers varying the throw imparted to the slide block for the same amplitudesof oscillations ofthe levers, and means for determining the relative adjustmentof the levers necessary to prodw 3 a given amount of movement of the slide block.

22. A centerless grinder including a bed, a grinding wheel carried by the bed, a regulating wheel slidably supported on the bed in opposition to the grinding wheel, and adj usting mechanism for the regulating wheel, including a slide block, a connection between the slide'block and regulating wheel, a spindle carried by the bed, a pair of levers pivotally supported on the spindle, one of said levers being of bell-crank formation, a link pivotally connecting one arm of said lever with the slide block, a stud carried by the other arm the second lever having an arcuate slot receiving the stud for coupling the levers for joint movement, means for securing the stud in desired adjusted position within the slot to vary the operative coupling of the two levers, and means for rocking the second lever to oscillate the slide block.

23. A centerless grinder including a bed. a grinding wheel carried by the bed, a regulating wheel slidably supported on the bed in opposition to the grinding wheel, and adjusting mechanism for the regulating wheel, in cluding a slide block, a connection between the slide block and regulating wheel, a spindle carried by the bed, a pair of levers pivotally supported on the spindle, oneof said levers being of bell-crank formation, a link pivotally connecting one arm of said lever with the slide block, a stud carried by the other arm, the second lever having an arcuate slot receiving the stud for coupling lating wheel slidably supported on the bed in opposition to the grinding wheel, and

adjusting mechanism for the regulating wheel, including a slide block, a connection 4 between the slide block and regulating wheel,

a spindle carried by the bed, a pair of levers pivotally supportedpn the spindle, one of said levers being of bell-crank formation, a

link pivota'lly connecting one arm of said lever with the slide block, a stud carried by the other arm, the second lever having an arcuate-slot receiving the studfor coupling the levers for joint movement, means for securing the stud in desired adjusted position within the slotto vary the operative coupling of the two levers, means for rock-- ing the second lever to oscillate the slide block, said means including a cam having a predetermined cyclic path formed thereon, and means for automatically limiting the movement of the cam to a single cycle of revolution.

25. In grinding apparatus, in combination, a grinding throat including at least three means, one of which is in the form of a grinding wheel rotated at a grinding speed, another of which is in the form of a regulating wheel rotated at a relatively low speed and in a direction to control the rotation of work of round section during the grinding action thereon by said grinding wheel, and another of which means includes a member for holding work of round section in operative relation to said two wheels, one of said means being mounted for movement in a direction to permit enlargement or restriction of the grinding throat; a cam having connections with said movable means and having a portion for effecting relatively rapid throat enlargement to permit the replacement of a ground work piece, another portion for effecting relatively rapid throat restriction, another portion for eflecting relatively gradual throat restriction, and another portion for maintaining substantially constant the restricted throat for a" period of time; and means for changing the amplitude of movement effected by .each portion of said cam while maintaining the relative characteristi of action of said portions.

26. In grinding apparatus, in combination,

J a grinding throat including at least three means, one of which is in the form of a grinding wheel rotated at a grinding speed, an-

in a direction to control the rotation of work of round sect-ion during the grinding action thereon by said grinding wheel, and another of which means includes a member for holding work of round section in operative relation to said two wheels, one of said means being mounted for movement in a direction to permit enlargement or restriction of the grinding throat; a 'cam having connections with said movable means and having a portion for effecting relatively rapid throat enlargement to permit the replacement of a ground work piece, another portibn for effecting relatively rat id throat restriction, another portion for e ecting relatively gradual throat restriction, and another portion for maintaining substantially constant the restricted throat for a period of time, said connections including lever means actuated by said cam portions and having two lever arms the angle between which is variable at will for changing the amplitude of movement caused by each portion of said cam.

27 In grinding apparatus, in combination, a grinding throat including at least three means, one of which is in the form of a grinding wheel rotated at a grinding speed, another of which is in the form of a regulating wheel rotated at a relatively low speed and in a direction to control the rotation of work of round section during the grinding action thereon by said grinding wheel, and another of which means includes a member for holding work of round section in operative relation to said two wheels, one of said means being mounted for movement in a direction to permit enlargement or restriction of the grinding throat; a cam having connections with said movable means and having a portion for effecting relatively rapid throat enlargement to permit the replacement of a ground work piece, another portion for effecting relatively rapid throat restriction, another portion for effecting relatively gradual throat restriction, and another portion for maintaining substantially constant the restricted throat for a period of time, said connections including means forming a'bell crank lever, one arm of which is actuated by said cam and the other arm of which'efiects movement of said movable means; and means adapted at will to change the angle between the arms of said lever.

28. In grinding apparatus, in combination, a grinding throat including at least three means, one of which is in the form of a grinding wheel rotatedat a-grinding speed, another of which is in the form of a regulating wheel rotated at a relatively low speed and in a direction to control the rotation of work of round section during the grinding action thereon by said grinding wheel, and another of which means includes a member for holding work of round section in operative rela-means, one of which is in the form of a tion to said two wheels, one of said means being mounted for movement in a direction to permit enlargement or restriction of the grinding throat; a cam having connections with said movable means and having'a portion for effecting relatively rapid throat enlargement to permit the replacement of a ground work piece, another portion for. effecting relatively ra id throat restriction, another portion for e ecting relatively grad ual throat restriction, and another portion for maintaining substantially constant the restricted throat for a period of time, said connections including a lever oscillated by the portions of said cam; and variable connections between said lever and said movable means for changing the amplitude of movement of said movable means without changing the amplitude of movement of said lever.

29. In grinding apparatus, in combination, a grinding throat including at least three means, one of which is in the form of a grinding wheel rotated at a grinding speed, another of which is in the form of a regulating wheel rotated at a relatively low speed and in a direction to control the rotation of work of round section during the grinding action thereon by said grinding wheel, and another of which means includes a memberior holding work of round section in operative relation to said two wheels, one of said means being mounted for movement in a direction to permit enlargement or restriction of the grinding throat means forming a twosarmed lever, one arm.of which is connected to said movable means and makes an angle with the other arm; means operative upon said other arm for actuating said lever; and means for varying at will the angle between said two arms. I 1

30. In grinding apparatus, in combination, a grinding throat including a least three means, one of which is in the form of a grinding wheel, rotated at a grinding speed, an-,v

other of which is in the form of a regulating wheel rotated at a relatively low speed and in a direction to control the rotation of work of round section during the grinding action thereon by said inding wheel, and another of which means includes a member for holding work of round section in operative relation to said two wheels, one ofsaid means be-f ing mounted for movement in a direction to permit enlargement or restriction of the grinding throat; means forming a two-armed lever, one arm of which is connected to said *movablemeansand makes an angle with the other'arm; means operative upon said other arm for actuating said lever; and means for varying the effective length of on'eof said lever arms. I

31. In grinding apparatus, in combination, a grinding throat including at least three grinding wheel rptated at a grinding speed, another, of which is in the form of a regulating wheel rotated at a relatively low speed and in a direction to control the rotation of work of round section during the grinding action thereon by said grinding wheel, and

another'of which means includes a member for holding work of round section inoperative relation to said two wheels, one of said means being mounted for movement in a direction to permit enlargement or restriction of the grinding throat; means forming a bell crank lever having two arms; means operative upon one of said arms for actuating said lever; alink pivotally connected to the other other of which is in the form of'a regulating 'wheel rotated at a relatively low speed and in a direction to controlthe rotation of work of round section during the grinding action thereon by said grinding wheel, and another 1 of which means includes a member for holdmg work of round sectlon 1n operatlve relation to said two wheels, one of said "means being mounted for movement in a direction to permit enlargement or restriction of the grinding throat; a cam; and means for transmitting motion from the successive portions of saidv cam to said movable means and constructed to be controlled-at will to vary the extent of the transmitted motion without varying the relative effects of the portions of said cam.

33. In grinding apparatus, incombination, a grinding throat including at least three means, one of which is in the form of a grinding wheel rotated at a grinding speed, another of which is in the form ot a regulating wheel rotated at a relatively low speed andin a direction to control the rotation of Work of round section during the grinding action thereon by said grinding wheel, and another of which means includes a member for holding work of round section in operative relation to said two wheels, one of said means being mounted for movement in a direction tovpermit enlargement or restriction of the grinding throat; a cam having difierent cam portions for determining the characteristics of the movement" of said movable means; means including linkages for connecting saidcam to said movable means; and means for changing at will the relation of the axis about which one link of said linkages swings with respect to at least one other axis of said linkages for varying the amplitude of the motion transmitted to said movable means by the various portions of said cam.

34. In grinding apparatus, in combination, a grinding throat including at least three means, one of which is in the form of a grinding wheel rotated at a grinding speed, another of which is in the form of a regulating wheel rotated at-a relatively low speed and in a direction to control the rotation of work of round section during thef grinding action thereon by saidgrinding wheel, and another of which means includes a member for holding work of round section in operative relation to said two wheels, one of said means being mounted for movement in a direction to permit enlargement or restriction of the grinding throat; power driven means operating upon said movable means for enlarging and restricting the grinding throat; and means controllable at will to cause said power driven means to efiect enlargement and restriction of said grinding throat in recurring cycles or to cause said power driven means to effect only one cycle of change in said grinding throat or to cause said power driven means to cease movement of said movable means at any point in a cycle.

35. In grinding apparatus, in combination, a grinding throat including at least three means, one of which is in the form of a grinding wheel rotated at a grinding speed, another of which is in the form of a regulating wheel rotated at a relatively low speed and in a direction to control the rotation of work of round section during the grinding action thereon by said grinding wheel, and another of which means includes a member for holding work of round section in operative relation to said two wheels, one of said means bering cycles; cam-controlled means operative to halt the movement of said movable means at a certain point 111 any'one cycle of its movements, and means for making said cam;con-

trolled mean's ineffective so as to permit said power driven means to operate upon said movable means in recurring cycles.

36. In grinding apparatus, in combination, a grinding throat including, at least three means, one of which is the form of a grinding wheel rotated at a grinding speed, an-

other of which is in the form of a regulating wheel rotated at-arelatively low speed and in a direction to control the rotation of work of round section during the grinding action thereon by said grinding wheel, and" another of which means includes a member for holding work of round section in operative relation to said two wheels, one of said means being, mounted for movement in a direction to permit enlargement or restriction of the grinding throat; power driven means operating upon said movable means for enlarging and restricting the grinding throat in recur? ring cycles; cam-controlled means operative to halt the movement of said movable means at a certain point in any one cycle of its moveing wheel rotated at a grinding speed, an-

other of which is in the form of a regulating wheel rotated at a relatively low speed and in a direction to control the rotation of work of round section during the grinding action thereon by said grinding wheel, and another of which means includes a member for holding work of round section in operative relation to said two wheels, one of said means being mounted for movement in a direction to permit enlargement or restriction of the grinding throat; work-feeding means, workejecting means, means for controlling the movement of said movable means for enlarging and restricting the grinding'throat and for controlling said work-feeding means and said work-ejecting means and adapted to effect sequential operation thereof in recurring cycles, means automatically operative 'for halting the sequential operation of said means at a certain point in a cycle, and means for halting the sequential operation of said means at any point in a cycle.

In witness whereof, we hereunto subscribe our names.

GEORGE W. BINNS. \VALTER D. ARCHEA. LESTER F. NENNINGER. 

